Artificial denture.



No. 647,400. Patented Apr. l0, I900 A; T. GLEW.

ARTIFICIAL DENTUBE.

(Application filed Aug. 1, 1899.)

(No Model.)

I Lflrfiiur If Gleu).

A TTOHNEYS.

UNITED STATES PATENT OFFICE.

ARTHUR THOMAS GLEW, OF GERMANTOYVN, OHIO.

ARTIFICIAL DENTURE.

SPECIFICATION forming part of Letters Patent No. 647,400, dated April10, 1900.

Application filed August 1, 1899. Serial No- 725,745. (No model.)

To (LZZ whom, it may concern:

Be it known that I, ARTHUR THOMAS GLEW, residing at Germantown, in thecounty of Montgomery and State of Ohio, have made an Improvement inArtificial Dentures, of which the following is a specification.

In the accompanying drawings, Figure 1 is a sectional View illustratingmy invention, and Fig. 2 is a similar view illustrating the commonconstruction or arrangement of 'artificial dentures.

It is the usual practice of dentists to form and apply artificialdentures insuch manner that the lower front or incisor teeth bite insidethe upper ones, as illustrated in Fig. 2. The inner sides of the upperincisors abeing inclined or sloping, the inevitable result is a leverageof the lower teeth 11 upon the same in such manner as to press the upperteeth a forward, and consequently throw down the rear end of the plate0, to which the incisors aiare attached. In other words, thepremaxillary portion dot the upper jaw serves as afulcrum, upon whichthe plate 0 is tilted, as indicated by arrows, so as to dislodge thedenture whenever the teeth a b bite upon each other with considerableforce. I have devised a plan and construction whereby this result is notonly avoided, but the plate in reality pressed more firmly against theroof of the month.

In carrying out myinvention I provide the upper incisors (see Fig. 1) ofa plate 4 with a transverse base-groove whose rear side is a curvedprojection 2, and I also arrangethe lower incisors3 to strike or biteupon the inclined inner side of such shoulder or projection 2, as shown,whereby they exert a pressure upward and backward upon the rear portionof the plate 4, as shown by the arrows, Fig. 2. In other words, theplate 4 is pressed upward upon the roof of the mouth instead of beingthrown down by leverage, as in the oldmethod of construction. projection2 is made shorter than the front portions of the teeth, so that thelatter present practically the usual appearance, and the transversegroove is of uniform depth instead of being shallower at the middle, asin natural and artificial bicuspids and molars. This form-afiords a goodarticulation or flat surface of contact between the upper teeth 1 andlower ones 3.

It will be observed that the gum of the plate extends downward at 5 uponthe rear sides of the teeth 1 and practically forms a backing for thebase shoulder or projection 2, so that the teeth 1 are adapted to resistleverage to a high degree.

In brief, the strength and durability of the denture are thus materiallyincreased.

My invention is particularly useful in the case of dentures applied inmonths having a flat roof or which are otherwise sopeculiar' as torender it very difficult to retain the plate in place.

What I claim is--- The improved artificial denture hereinbe foredescribed, consisting of the upper plate 4, having front or incisorteeth 1, which are each provided with a transverse base-groove extendingacross it, the rear projection 2 which is of less length than the frontone and inclined on the inner side as shown, whereby inclinedbiting-surfaces for the lower incisors are provided, and also points ofleverage for the same so that the plate is pressed backward and alsoupward at the inner end, as shown and described.

ARTHUR THOMAS GLEW. Witnesses:

JOHN Mans, SERVETUS It. FULTON.

The rear

